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(No Mom.) V 2 sheetssheet 1.

E. J. MORB.

WATER TUBE BOILER.

(No Model.) 2 Sheets-Sheet 2.'

E. J. MOORE.

WATER TUBE BOILEB..

N0.3o9,352. Patented Dec. 16, 1884.

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EDWARD J. MOORE, or BALTIMORE, MARYLAND.

WATERjTUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 309,352, dated December 16, 188%.

Application filed February 4, 1884. (No model.)

To @ZZ wiz/0771, it may `con/cern:

Be it known that I, EDWARD J MOORE, of the city of Baltimore and State of Maryland, have invented certain Improvements in Vater-Tube Boilers, of which the following is a specification. This invention consists, rst, in constructing what are generally termed the legs7 or headers of a boiler wholly or in part of polygonal tubes placed side by side, and united at several points throughout their length by means of thimbles which are secured in the adjoining faces or sides of the tubes.

The said invention consists, secondly," in uniting the front and rear legs or headers, constructed in the manner above described, by :means of a system of tubes divided into two lengths or sections of different diameters, united by a central leg, into which the ends of the tubes are expanded.

rIlhe said invention consists, thirdly, in com bining with the front leg or header, constructed as described, a series of vertical tubes of polygonal shape, located eXteriorly ofthe leg,into which steam as formed in the heating-tubes and the legs is delivered and carried to the drum.

The said invention consists, fourtlily, in combining with the exteriorvertical polygonal tubes aforesaid a gang of pipes, which forms the means of communication between the said tubes and the steam-drum, the said gang being in contact with the tire in such manner as to admit of the steam therein being superheated, and also provided with a system of circulatingpipes to conduct water carried forward and upward with the steam to the rear or back leg.

The said invention consists, fifthly, in providing the cleaning-apertures opposite the varioustubes with thimbles having slotted inner ends, and the said thinibles with exterior caps and anchor-bolts, the enlarged ends of which rest in the slots in the thimbles aforesaid.

'lhe said invention consists, sixthly, in certain details of construction of various parts of the boiler, as will hereinafter fully appear.

In the further description of the said invention which follows, reference is made to the accompanying drawings, forming a part llereof, and in whichl Figure I is alongitudinal section of the improved boiler. Fig. II is a partly-sectional front view of the boiler. Fig. III is a partlysectional rear view of the invention. Figs. IV, V, and VI are views of parts of the invention on an enlarged scale.

A and B are respectively the front and rear water-heating tubes, connected by the leg C, into which they are expanded. The leg C is wide enough to admit of the entrance thereto of a person to clean the tubes, or to expand them in the building or repairs of the boiler. The said leg is suitably braced to give it strength, but only one ofthe braces is shownin the drawings, and that is in Fig. I. The tubes A have an internal diameter greater than the external diameter of the ones B. Consequently the tubes B may be inserted through the ones A in the construction or repair of the boiler.

D D are polygonal tubes, preferably with a practically square cross-section, as shown, in which the heating-tubes A and B are inserted and expanded. rIhe polygonal tubes may be made of either cast, malleable, or wrought iron or steel, and if of either wrought-iron or steel they can be first made of a circular shape, and then heated and rolled into the polygonal form. The object of this polygonal form is to obtain a flat surface into which the heating-tubes are inserted and expanded, and also to admit of the insertion and expansion of thimbles opposite to the tubes, which thimbles are provided with caps, and bolts to hold the caps in place, as hereinafter fully described. Thef said thimbles, which are denoted by a and b, are of two kinds, the ones ce (see particularly Figs. IV and V) having caps c, and the others, Z, (see Fig. VL) being used to connect the polygonal tubes D with the vertical exterior tubes, E, which have a polygonal crosssection corresponding to that of the ones D. ,The thimbles a have notches (l at their inner ends, into which the anchor- 9 5 IOO a central position. The caps c may be of any suitable description; but they are preferably grooved, and the grooves filled with metallic packing, which is forced closely in contact 5 With theends of the thirnbles a.

- F F are polygonal tubes located above and secured in any suitable manner to the tubes E E, and the front and rear ones are connected by pipes G, which extend' longitudinally of the boiler in the form of a gang, andthe rear end of the gang is united to the rear exterior vertical tubes, E, by pipes H, through which Water carried with the steani toward the druni I is returned to the boiler proper. It willbc seen that the central leg, C, is used as a Harnedelecting plate and a bridge-wall, and its lower end isennployed as a mud-drum.

I claim as my inventionl. In a water-tube boiler, the legs or headers thereof, constructed wholly or in part of polygonal tubes placed side by side, and united at several points throughout their length by ineans of thilnbles which are secured in the adjoining faces or sides of the said tubes, sub 25 stantially as specified.

2. In a sectional water-tube boiler, the front and rear legs thereof, constructed wholly orin part of polygonal tubes placed'side by side,

and united at several points throughout their v 3o length by means of thinibles secured in theadbined with a system of inclined heatingtubes in two lengths or sections of different diameters, which are connected by a central leg, substantially as specified. 3 5

3. In a water-tube boiler, thelegs or headers l thereof,which consist wholly or in part of pologyonal tubes placed side by side, and united at several points throughout their length by means of thinibles which are secured into ad` joining faces or sides of the said tubes, cornbined with a series of exterior vertical polygonal tubes to conduct steanr. from the Various rows of heating-tubes toward the drum, substantially as specified. v

4. In a-water-tube boiler, the legs thereof opposite the water-tubes provided with thimbles having slottedv inner ends, exterior caps, and anchor-bolts adapted to rest in the said slots,substantially as and forthe purpose specifled.

5. In a sectional water-tube boiler, the heatingtubes thereofin two lengths or sections of different diameters connected by a central leg, which extends to a point below the grate-bars 55 to forni a bridge-wall, substantially as specilied.

EDWARD J. MOORE.

Witnesses:

WM. T. HOWARD, CHAs. B. CAssAnY. 

